TMRC-Filter:一种基于Filtered OFDM系统的子带滤波器设计方法

doi:10.7523/j.issn.2095-6134.2020.01.014

中国科学院大学学报 ›› 2020, Vol. 37 ›› Issue (1): 120-127.DOI: 10.7523/j.issn.2095-6134.2020.01.014

TMRC-Filter:一种基于Filtered OFDM系统的子带滤波器设计方法

李颖锐^1,2, 徐景¹, 刘响^1,2, 易辉跃¹

1 中国科学院上海微系统与信息技术研究所微系统技术重点实验室, 上海 201800;
2 中国科学院大学, 北京 100049

收稿日期:2018-09-13 修回日期:2018-11-28 发布日期:2020-01-15
通讯作者: 徐景
基金资助:
国家自然科学基金（61571303）资助

TMRC-Filter: a subband filter design method for Filtered OFDM system

LI Yingrui^1,2, XU Jing¹, LIU Xiang^1,2, YI Huiyue¹

1 Science and Technology on Microsystem Laboratory, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 201800, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China

Received:2018-09-13 Revised:2018-11-28 Published:2020-01-15

摘要/Abstract

摘要： 为满足滤波正交频分复用系统中子带滤波器的要求，基于升余弦函数，设计满足目标频率响应的通带边缘滚降到截止幅度且可自由调节滚降带宽的线性相位滤波器，并采用窗函数法软截断其时域冲激响应，得到缩短型-修正软截断升余弦子带滤波器。所设计的子带滤波器的性能可仅通过滚降带宽和滚降系数进行调节，实现较为简单。仿真结果表明，所设计的子带滤波器相比于软截断SinC型子带滤波器有较小的通带波纹系数、较大的阻带衰减和较高的时域集中度，相比于软截断升余弦子带滤波器RC-Filter有较窄的过渡带。

关键词: 数字通信技术, 缩短型-修正软截断升余弦子带滤波器, 线性相位滤波器, Filtered OFDM

Abstract: In order to satisfy requirements for the subband filter in Filtered-OFDM (filtered-orthogonal frequency division multiplexing) systems, the TMRC-Filter (truncate modified raised-cosine filter) is proposed based on the window function method. Compared with the traditional SinC-Filter (windowed sinc function filter) and RC-Filter (raised-cosine filter) whose linear phase filter ends with 0, the linear phase filter of the proposed TMRC-Filter ends with a non-zero roll-cut-off-amplitude factor, and the rolled-off bandwidth of the proposed TMRC-Filter can be flexibly adjusted. Moreover, the performance of the rpoposed TMRC-Filter is totally determined by the rolled-off bandwidth which is independent of the system parameter and roll-off factor, and it is simple to implement. The simulation results show that the TMRC-Filter achieves the lower ripple, larger stop-band attenuation, and better time localization than the SinC-Filter and the narrower transition band than the RC-Filter.

Key words: digital communication technology, TMRC-Filter, linear phase filter, Filtered OFDM

中图分类号:

TN929.5

李颖锐, 徐景, 刘响, 易辉跃. TMRC-Filter:一种基于Filtered OFDM系统的子带滤波器设计方法[J]. 中国科学院大学学报, 2020, 37(1): 120-127.

LI Yingrui, XU Jing, LIU Xiang, YI Huiyue. TMRC-Filter: a subband filter design method for Filtered OFDM system[J]. , 2020, 37(1): 120-127.

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TMRC-Filter:一种基于Filtered OFDM系统的子带滤波器设计方法

TMRC-Filter: a subband filter design method for Filtered OFDM system

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